.header{
  height: 50px;
  margin: 10px 0;
  display: flex;
  justify-content: center;
  align-items: center;
}
.header input{
  width: 90%;
  height: 40px;
  border-radius: 10px;
  font: bold 20px/40px '楷体';
  padding: 0 5px;
  outline: none;
  border:2px solid  cadetblue;
  transition: .5s;
}
.header input:hover{
  transition: .5s;
  box-shadow: 5px 5px 15px cadetblue;
}

